Depending on what CD player you want to install..One of the easiest ways to o it would be to install a factory Alpine 6-disc in dash CD player,these can be found on ebay for about 120.00.Or check around at local salvage yards for a CD player.. They are simple to install and all your factory wiring will connect to it..
To install a after market CD player you need a aftermarket wiring harness that will connect to the factory wiring harness,this wiring harness will power the CD player and run all your speakers..It cost about 50.00 for that harness..The wiring harness for the radio controls is separate and that harness cost about 100.00..All the wire's are color coordinated were they connect from the aftermarket wiring harness to the aftermarket CD player..You will also need a aftermarket mounting brackets to fit in were the original Radio was install..The mounting brackets are about 40.00
The dash does come apart pretty easy..The re-install directions and removal directions will be in the mounting bracket kit..
I installed a double din DVD player in my LS in 2 hours,and did it for around 200.00,Everyone else was charging 350.00 and 400.00 to install.

Sure. Get a the one you want from a junkyard, and change it.
Another thing you might try is an after-market CD player that runs off your existing Cassette Player.
There is something that looks like a cassette tape on the end of the cable from the CD player.
It goes into the Cassette Deck just like a tape, but it puts the signal from the CD player into the Cassette Deck through the tape head.
This can be the easy solution, without having to disassemble anything.